EP2391145B1 - Dispositif d'ajustement et procédé d'ajustement d'un dispositif auditif pour compenser la perte de l'audition d'un utilisateur - Google Patents

Dispositif d'ajustement et procédé d'ajustement d'un dispositif auditif pour compenser la perte de l'audition d'un utilisateur Download PDF

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EP2391145B1
EP2391145B1 EP10164506.7A EP10164506A EP2391145B1 EP 2391145 B1 EP2391145 B1 EP 2391145B1 EP 10164506 A EP10164506 A EP 10164506A EP 2391145 B1 EP2391145 B1 EP 2391145B1
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Prior art keywords
feedback
feedback path
hearing device
invariant
measured
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EP2391145A1 (fr
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Guilin Ma
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GN Hearing AS
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GN Resound AS
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Priority to DK10164506.7T priority Critical patent/DK2391145T3/en
Priority to EP10164506.7A priority patent/EP2391145B1/fr
Priority to US13/025,113 priority patent/US8744103B2/en
Priority to JP2011120556A priority patent/JP5455976B2/ja
Priority to CN201110156679.XA priority patent/CN102316403B/zh
Publication of EP2391145A1 publication Critical patent/EP2391145A1/fr
Priority to US14/142,060 priority patent/US9374645B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/70—Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting

Definitions

  • the present specification relates to a fitting device for fitting a hearing device to compensate for the hearing loss of a user and to a corresponding method. Additionally, the present specification relates to a method of reducing feedback in a hearing device and to a corresponding hearing device.
  • a hearing device comprising a receiver and a microphone may experience feedback.
  • Feedback is a severe problem. It refers to a process in which a part of the receiver output is picked up by the microphone, amplified by the hearing device processing and sent out by the receiver again.
  • the hearing device amplification is larger than the attenuation of the feedback path, instability may occur and usually results in feedback whistling, which limits the maximum gain that can be achieved, and thus feedback compromises the comfort of wearing hearing devices.
  • US 6,072,884 discloses an alternative form of the feedback path model, which represents the feedback path with two parts: a short adaptive FIR filter and a fixed filter (usually an IIR filter).
  • the fixed filter aims at modeling the invariant or slowly-varying portion of the feedback path, whereas the adaptive filter tracks the rapidly-changing part.
  • This model generally yields a shorter adaptive FIR filter, a faster converging speed and a smaller computational load.
  • the way to obtain the coefficients of the fixed filter in practice is to measure the feedback path for each individual user when the hearing aid is fitted to the user by a dispenser or other person trained in fitting the hearing aid to the user, and fit the fixed filter to model the measured response.
  • This not only requires an additional fitting step, but also fails to capture the true invariant part of the feedback path because the feedback path measured by the dispenser already includes some of the variant parts.
  • the above measured feedback path includes not only the invariant effects but also some variant effects.
  • the fitting of the hearing aid in the ear canal is included in the invariant part but it may be subject to changes, e.g. when the hearing aid is re-inserted in the ear.
  • the article " Fixed filter implementation of feedback cancellation for in-the-ear hearing aids" from Woodruff et al. discloses a fitting device for fitting a hearing device to compensate for the hearing loss of a user; the hearing device comprising a receiver and a microphone, and wherein a feedback path exists between the receiver and the microphone; and wherein the hearing device further comprises a feedback canceller adapted to reduce the feedback; and wherein the feedback canceller comprises a fixed filter for modeling an invariant portion of the feedback path and an overall gain, wherein the fitting device is adapted to provide the fixed filter with information relating to the invariant portion of the feedback path independently of an actual user using the hearing device.
  • a fitting device for fitting a hearing device for fitting a hearing device according to claim 1.
  • the fitting device is able to provide parameters to the fixed filter, which parameters are describing the invariant portion of the feedback path; and thus the fixed filter does not comprise portions varying with time.
  • the information may be provided independently of the acoustical environments where the hearing device is put into use.
  • the provision of the information comprises calculating the invariant portion of the feedback path using information retrieved from a population.
  • the fitting device is adapted to retrieve the invariant portion of the feedback path from population data obtained prior to an actual hearing device being fitted to a user; and thereby, the fitting device is adapted to provide the invariant portion of the feedback path to the fixed filter; which invariant portion does not include time-varying parts.
  • a processor contained in the fitting device is adapted to calculate the invariant portion based on a plurality of measured feedback paths, wherein the plurality of measured feedback paths are measured on a plurality of users for a type of hearing device substantially identical to the hearing device within production tolerances.
  • the invention further relates to a method of fitting a hearing device to compensate for the hearing loss of a user according to claim 3.
  • the method of fitting and embodiments thereof comprises the same advantages as the fitting device for the same reasons.
  • the invariant portion is additionally provided independently of the acoustical environments where the hearing aid is put into use.
  • the fitting comprises calculating the invariant portion using information retrieved from a population.
  • the fitting comprises calculating the invariant portion based on a plurality of measured feedback paths, wherein the plurality of measured feedback paths are measured on a plurality of users for a type of hearing device substantially identical to the hearing device within production tolerances.
  • the method of fitting further comprises performing an online calibration of the hearing device on a user once the invariant portion of the feedback path has been provided to the hearing device.
  • a hearing device may be selected from the group consisting of a hearing aid, a hearing prosthesis, and the like.
  • Examples of a hearing device may include a behind the ear (BTE) hearing aid and a in the ear (ITE) hearing aid and a completely in the canal (CIC) hearing aid.
  • BTE behind the ear
  • ITE in the ear
  • CIC completely in the canal
  • Figure 1 shows a hearing device 100 comprising a microphone 101 and a receiver 102.
  • a feedback path 107 comprising an impulse response b(n) exists between the receiver 102 and the microphone 101.
  • the feedback path 107 may be an acoustical and/or an electrical and/or a mechanical feedback path.
  • n denotes a discrete-time index and n starts from 0.
  • the hearing device 100 may further comprise a processor 106 or the like adapted to process the signal from the microphone 101 according to one or more algorithms.
  • the hearing device may comprise a fixed filter 104 containing an invariant portion of a feedback path model.
  • the hearing device comprises an adaptive feedback canceller 103.
  • the adaptive feedback canceller 103 comprises a fixed filter 104 containing an invariant portion of a feedback path model, and an adaptive filter 105 containing a variant portion of feedback path model.
  • the adaptive feedback canceller 103 may divide an impulse response of a feedback path model ⁇ ( n ) into two parts: the invariant feedback path model comprising an impulse response f(n) and the variant feedback path model comprising the impulse response e(n).
  • the adaptive feedback canceller may track variations of the feedback path b(n) using the invariant ⁇ ( n ) and the variant e(n) feedback path models.
  • the invariant feedback path model may be contained in a finite-impulse-response (FIR) filter or in an infinite-impulse-response (IIR) filter.
  • FIR finite-impulse-response
  • IIR infinite-impulse-response
  • extraction of the invariant part of the feedback path can be done by measuring it directly.
  • the invariant part is coupled with the variant part in the feedback path very closely, it may be very difficult to isolate the invariant part unless each component is detached from the hearing device and measured individually, which requires high precision in the measurements.
  • the measured invariant part is only valid for a single device due to the variation within the batch of components.
  • each component is modeled either theoretically by using an equivalent electro-acoustical model or numerically by using methods such as boundary element calculations. To yield a good estimate of the invariant part, these methods need to build a precise model for every component, which may be difficult for some of the components.
  • the invariant feedback path model 104 is extracted from a set of measured feedback paths.
  • the idea is to measure a number of feedback paths using the same type of hearing devices on different users and/or under different acoustical environments.
  • the invariant part of the feedback path can then be regarded as the common part of these measured feedback paths.
  • N feedback paths comprising the impulse responses b 1 ( n ) ; b 2 ( n ) ; ... ; b N ( n ) may have been measured.
  • the feedback path impulse responses may have infinite duration. Therefore, it may be assumed in the following that the impulse responses of the feedback paths and the feedback path models are all truncated to a sufficient length L .
  • the feedback paths and the feedback path models may be truncated such that the energy loss in the impulse response due to the truncation is at least 35 dB below the total energy of the responses.
  • the N feedback paths may constitute a population.
  • f ( n ) and e k ( n ) denote the impulse response of the invariant model and the variant model of the k -th feedback path respectively.
  • One way to extract the invariant part is to formulate a problem of extracting the invariant feedback path model.
  • the extraction problem may be formulated by estimating ⁇ ( n ) with the objective of minimizing the difference between the modeled feedback path b ⁇ k ( n ) and the measured feedback path b k ( n ) . Due to the different vent sizes, pinna shapes and microphone locations for different users, some of the measured feedback impulse responses may contain more energy than others. This may result in a preference of minimizing the modeling error for large feedback paths. If the measurement is conducted in the same way for all the measured feedback paths, every measured feedback path should be treated equally.
  • ⁇ ⁇ 2 denotes the Euclidean norm
  • the superscript T denotes the transpose of a matrix or a vector
  • b ⁇ k ( n ) is defined in equation (1).
  • the bold symbol represents a matrix or a vector.
  • Equation (2) - (6) represents an optimization problem which is non-linear.
  • solution methods based on a common-acoustical-pole and zero modeling (CPZ) model and an iterative least-square search (ILSS) method and a combination of the two are described.
  • CPZ common-acoustical-pole and zero modeling
  • ILSS iterative least-square search
  • the extraction problem is formulated in the frequency domain and a weighting for the importance of each frequency bin can be applied on the optimization problem. This will require a corresponding change in the below mentioned solution methods (CPZ, ILLS and a combination of the two).
  • the optimization problem described above is solved using a common-acoustical-pole and zero modeling (CPZ).
  • CPZ common-acoustical-pole and zero modeling
  • the invariant part includes the responses of the receiver, the tube inside the hearing device shell, the hook, the microphone, etc., most of which also exhibit resonances. Therefore, it should also contain common poles although common zeros may also exist.
  • the CPZ model should capture the majority of the invariant part of the feedback path if the number of common zeros is not very large. In this case, the small number of common zeros can be moved to the short FIR filter in the variant model e k ( n ) .
  • the complete feedback path model becomes an Autoregressive Moving Average (ARMA) model:
  • ⁇ i 's are the coefficients of the common Autoregressive (AR) model
  • ⁇ i , k 's are the coefficients of the Moving Average (MA) model for the k -th feedback path model.
  • the impulse responses f(n) and e k ( n ) then correspond to the impulse response of the
  • the optimization problem described above is solved using an Iterative least-square search (ILSS) method.
  • ILSS Iterative least-square search
  • the invariant model of a feedback path may contain not only poles but also zeros. Therefore, the ILSS approach, which does not make assumptions on the pole-zero structure but estimates the impulse response directly, may be more general than the CPZ method.
  • the feedback path model b ⁇ k ( n ) of the length L is then the convolution between e k ( n ) and ⁇ ( n ) with zero-padding: Where 0 1 x ( L +1- M - C ) is a row vector with ( L + 1 - M - C ) zeros, the convolution matrices E k and F are formed by e k ( n ) and ⁇ ( n ) respectively and defined in Appendix B.
  • the optimization problem described above is solved using a combination of the iterative least-square search method and the common-acoustical-pole and zero modeling method.
  • the combination of the ILSS and CPZ methods is referred to as the "ILSSCPZ" method.
  • the ILSSCPZ method uses the estimate from the CPZ model-based approach to provide an initial estimate for the ILSS approach.
  • the invariant model is first extracted by the CPZ model-based approach using a number of poles e.g. 11 poles, and then the impulse response of the extracted AR model is truncated to serve as an initial estimate in the ILSS method.
  • the components along the feedback path can be divided into three categories:
  • the components in Category II and III cause a large inter-subject variability in the feedback path and a large variation of the feedback path over time.
  • the feedback path model comprises the invariant feedback path model contained in the fixed filter 104 and representing the invariant components, such as category I components such as the hearing device receiver, microphone, tube attached to the receiver inside the hearing device shell, etc.
  • the feedback path model may comprise a slowly varying model used to model the slow changes in the components in category I (due to aging and/or drifting), category II components such as user dependent components, which include the PVC tubing, earmold, pinna, etc (due to the slow changes in the hearing-aid fitting) and category III (due to the slow changes in the acoustical environment).
  • the feedback path model may comprise a fast varying model used mainly for modeling the rapid and dramatic changes in the external acoustics, for example, when the user picks up a telephone handset.
  • the invariant model may be determined as disclosed above and below and it may be contained in the fixed filter 104.
  • the slowly varying model and the fast varying model may be contained in the adaptive filter 105 as two cascaded adaptive filters with different adaptation speeds.
  • a slow adaptation speed in the order of seconds may be used to model the slowly varying components; and a fast adaptation speed in the order of milliseconds may be used to model the fast varying components.
  • the hearing device may contain a switch (not shown) controlling which of the two adaptive filters (either the one modeling the slowly varying components or the one modeling the fast varying components) is active in combination with the fixed filter.
  • the measured feedback paths are measured on a plurality of users using the same type of hearing device i.e. the same hearing device within manufacturing tolerances.
  • a batch of 10 hearing devices may be tested on a group of 100 individuals (each hearing device being tested on each individual thus resulting in 1000 feedback path measurements in total) and the feedback paths of each of the individuals may be utilized to determine the invariant portion of the feedback path model according to the above and below.
  • the determined invariant portion of the feedback path model may be implemented in a number of subsequent batches of hearing devices e.g. the next 100 batches of hearing devices.
  • the hearing device is a digital hearing device such as a digital hearing aid.
  • Figure 2 shows an embodiment of a device 201 for fitting a hearing device 100 to compensate for the hearing loss of a user.
  • the hearing device 100 may be a hearing device according to figure 1 and it may comprise a receiver and a microphone, and wherein a feedback path exists between the receiver and the microphone.
  • the hearing device 100 may further comprises an adaptive feedback canceller 103 adapted to reduce the feedback; and wherein the adaptive feedback canceller comprises a fixed filter 104 for modeling an invariant portion of the feedback, and an adaptive filter 105 for modeling a variant portion of the feedback.
  • the hearing device 100 and the device for fitting 201 may further comprise respective communication ports 202, 204 such as a Bluetooth transceiver and/or an IR port and/or an IEEE port.
  • the fitting device 201 may be adapted to be communicatively connected to the hearing device 100 via a wired and/or wireless communication link 203 such as an electrical wire or a Bluetooth link established between the respective communication ports 202, 204 of the device for fitting 201 and the hearing device 100.
  • a wired and/or wireless communication link 203 such as an electrical wire or a Bluetooth link established between the respective communication ports 202, 204 of the device for fitting 201 and the hearing device 100.
  • the fitting device 201 is adapted to provide the invariant portion of the feedback path model as determined above to the fixed filter 104 of the hearing device 100 via the wired and/or wireless communication link 203. Further, the fitting device 201 may be adapted to provide one or more of the adaptations speeds of the two adaptive filters contained in the adaptive filter 105 of the hearing device 201 via the wired and/or wireless communication link.
  • the adaptive filters can be constrained by initializations carried out during the fitting or during the usage of the hearing device.
  • the invariant part is not trivial and the methods and devices described below and above can extract it to such a level that the yielded feedback path model can be used for a plurality of hearing device users.
  • the factors that limit the modeling accuracy of the feedback path given a fixed order of the variant model are twofold: Firstly, the methods themselves may converge to local minima. To improve these methods, some heuristic methods can be used to prevent the search from being trapped at the local minima easily. A simulated annealing method may in an embodiment be used as such a heuristic method. Secondly, in practice, both the variation within the batch of components and the individual characteristics are part of the variant model, which need a long FIR filter to model.

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Claims (10)

  1. Dispositif de montage d'un dispositif auditif afin de compenser la perte d'audition d'un utilisateur ; le dispositif auditif comprenant un récepteur et un microphone, et dans lequel un trajet de rétroaction existe entre le récepteur et le microphone ; et
    - dans lequel le dispositif auditif comprend en outre un dispositif d'annulation de rétroaction adaptatif adapté pour réduire la rétroaction ; et
    - dans lequel le dispositif d'annulation de rétroaction adaptatif comprend un filtre fixe pour modéliser une partie invariante du trajet de rétroaction et un filtre adaptatif pour modéliser une partie variante du trajet de rétroaction ; et
    dans lequel le dispositif de montage est adapté pour fournir au filtre fixe des informations concernant la partie invariante du trajet de rétroaction indépendamment d'un utilisateur réel utilisant le dispositif auditif, et
    dans lequel un processeur contenu dans le dispositif de montage est adapté pour calculer la partie invariante du trajet de rétroaction sur la base d'une pluralité N de trajets de rétroaction mesurés ayant des réponses d'impulsions b1(n), b2(n), ..., bN(n), dans lequel la pluralité de trajets de rétroaction mesurés est mesurée sur une pluralité d'utilisateurs pour un type de dispositif auditif sensiblement identique au dispositif auditif dans des tolérances de production, et dans lequel la partie invariante des trajets de rétroaction a une réponse d'impulsion f(n),
    la partie variante du kième trajet de rétroaction a une réponse d'impulsion ek(n) et le kième trajet de rétroaction modélisé a une réponse d'impulsion b k ^ n
    Figure imgb0046
     qui est la convolution de ek(n) et de f(n), et
    dans lequel le processeur est en outre adapté pour estimer la partie invariante des trajets de rétroaction ayant la réponse d'impulsion f(n) avec l'objectif de minimiser la différence entre les trajets de rétroaction modélisés et les trajets de rétroaction mesurés.
  2. Dispositif de montage selon la revendication 1, dans lequel le processeur est adapté pour mettre à l'échelle les réponses d'impulsions mesurées bk(n) à b k ˜ n
    Figure imgb0047
     de sorte que ∑ i = 0 L − 1 b k ˜ i 2
    Figure imgb0048
     soit une constante pour k quelconque.
  3. Procédé de montage d'un dispositif auditif afin de compenser la perte d'audition d'un utilisateur ; le dispositif auditif comprenant :
    un récepteur et un microphone ; et dans lequel un trajet de rétroaction existe entre le récepteur et le microphone ; et dans lequel le dispositif auditif comprend en outre :
    un dispositif d'annulation de rétroaction adaptatif adapté pour réduire la rétroaction et
    dans lequel le dispositif d'annulation de rétroaction adaptatif comprend :
    un filtre fixe pour modéliser une partie invariante du trajet de rétroaction et
    un filtre adaptatif pour modéliser une partie variante du trajet de rétroaction ; et dans lequel le procédé comprend :
    la fourniture au filtre fixe d'informations se rapportant à la partie invariante du trajet de rétroaction indépendamment d'un utilisateur réel utilisant le dispositif auditif par calcul de la partie invariante sur la base d'une pluralité N de trajets de rétroaction mesurés ayant des réponses d'impulsions b1(n), b2(n), ..., bN(n), dans lequel :
    la pluralité de trajets de rétroaction mesurés est mesurée sur une pluralité d'utilisateurs pour un type de dispositif auditif sensiblement identique au dispositif auditif dans des tolérances de production, et
    la partie invariante des trajets de rétroaction a une réponse d'impulsion f(n),
    la partie variante du kième trajet de rétroaction a une réponse d'impulsion ek(n) et le kième trajet de rétroaction modélisé a une réponse d'impulsion b k ˜ n
    Figure imgb0049
     qui est la convolution de ek(n) et f(n) :
    l'estimation de la partie invariante des trajets de rétroaction ayant la réponse d'impulsion f(n) avec pour objectif de minimiser la différence entre les trajets de rétroaction modélisés et les trajets de rétroaction mesurés.
  4. Procédé selon la revendication 3, dans lequel l'étape d'estimation est effectuée dans le domaine de la fréquence.
  5. Procédé selon la revendication 4, dans lequel une pondération de l'importance de chaque casier de fréquence est appliquée lors de la minimisation.
  6. Procédé selon la revendication 3, comprenant en outre l'étape de mise à l'échelle de réponses d'impulsions mesurées bk(n) à b k ˜ n
    Figure imgb0050
     de sorte que ∑ i = 0 L − 1 b k ˜ i 2
    Figure imgb0051
     soit une constante pour k quelconque.
  7. Procédé selon la revendication 3 ou 6, dans lequel le calcul de la partie invariante comprend la fourniture d'un modèle de zéro de pôle acoustique commun, dans lequel la partie invariante du trajet de rétroaction est modélisée par un filtre entièrement polaire avec P pôles et la partie variante du trajet de rétroaction est modélisée par un filtre FIR avec Q zéros.
  8. Procédé selon la revendication 3 ou 6, dans lequel le calcul de la partie invariante comprend la réalisation d'une recherche itérative des moindres carrés.
  9. Procédé selon la revendication 3 ou 6, dans lequel le calcul de la partie invariante comprend la fourniture d'un modèle de zéro à pôle acoustique commun comme estimation initiale pour une recherche itérative des moindres carrés.
  10. Procédé selon l'une quelconque des revendications 3 à 9, dans lequel le procédé comprend en outre la fourniture du filtre adaptatif avec deux filtres adaptatifs en cascade ayant différentes vitesses d'adaptation.
EP10164506.7A 2010-05-31 2010-05-31 Dispositif d'ajustement et procédé d'ajustement d'un dispositif auditif pour compenser la perte de l'audition d'un utilisateur Active EP2391145B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DK10164506.7T DK2391145T3 (en) 2010-05-31 2010-05-31 A fitting instrument and method for fitting a hearing aid to compensate for a user's hearing loss
EP10164506.7A EP2391145B1 (fr) 2010-05-31 2010-05-31 Dispositif d'ajustement et procédé d'ajustement d'un dispositif auditif pour compenser la perte de l'audition d'un utilisateur
US13/025,113 US8744103B2 (en) 2010-05-31 2011-02-10 Fitting device and a method of fitting a hearing device to compensate for the hearing loss of a user; and a hearing device and a method of reducing feedback in a hearing device
JP2011120556A JP5455976B2 (ja) 2010-05-31 2011-05-30 使用者の聴力損失を補うための聴覚装置をフィッティングするフィッティング装置および方法；および聴覚装置および聴覚装置におけるフィードバックを軽減する方法
CN201110156679.XA CN102316403B (zh) 2010-05-31 2011-05-31 助听设备及其验配设备和相应的方法
US14/142,060 US9374645B2 (en) 2010-05-31 2013-12-27 Fitting device and a method of fitting a hearing device to compensate for the hearing loss of a user; and a hearing device and a method of reducing feedback in a hearing device

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EP10164506.7A EP2391145B1 (fr) 2010-05-31 2010-05-31 Dispositif d'ajustement et procédé d'ajustement d'un dispositif auditif pour compenser la perte de l'audition d'un utilisateur

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EP2391145B1 true EP2391145B1 (fr) 2017-06-28

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DK2391145T3 (en) 2010-05-31 2017-10-09 Gn Resound As A fitting instrument and method for fitting a hearing aid to compensate for a user's hearing loss
US8638960B2 (en) 2011-12-29 2014-01-28 Gn Resound A/S Hearing aid with improved localization
US9148735B2 (en) 2012-12-28 2015-09-29 Gn Resound A/S Hearing aid with improved localization
US9148733B2 (en) 2012-12-28 2015-09-29 Gn Resound A/S Hearing aid with improved localization
US9338561B2 (en) 2012-12-28 2016-05-10 Gn Resound A/S Hearing aid with improved localization
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JP5455976B2 (ja) 2014-03-26
EP2391145A1 (fr) 2011-11-30
US20110293124A1 (en) 2011-12-01
US8744103B2 (en) 2014-06-03
JP2011254468A (ja) 2011-12-15
US9374645B2 (en) 2016-06-21
US20140112508A1 (en) 2014-04-24
CN102316403A (zh) 2012-01-11
DK2391145T3 (en) 2017-10-09
CN102316403B (zh) 2016-01-06

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